the future will be cableless/wireless. not just audio, but everything. the new top of the range lcd's and plasma's only have power cables now, everything else is wireless, even high capacity data that would go through HDMI. the point is its still all early technology, and so, not cheap.

10 years time is when we might start seeing the first completely wireless low power solutions (home and office) i.e. 230v. this is mainly down to inductive charging technologies, much like how an electric toothbrush charges. although you will probably be looking at 1-2 inductive devices per room to power all the electrical products in it.

Essentially, the electrical product and the inductive base form a two-part transformer, with the base having one part of the transformer and the electrical product having the other. When you have the product within a defined distance of the base, the complete transformer is created and power can flow.